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The closed investigation opens up the door for new questions. During the process of moving out, investigators said the person who disconnected the clothes dryer forgot to turn off the gas.

That evening, they noticed a natural gas odor and left a voicemail on Clara Bender's cellphone, a message she likely never heard.

"That she didn't get that message isn't the tenants fault. That wouldn't be Clare's fault. It wouldn't be the company's. It wouldn't be a fault. Everybody really did do what they thought was best," Jeremy Aspen, president of Certified Property Management, said.

The best, in this case, was far from it. Aspen said it's company policy not to give tenant's cellphone numbers. This is one reason why. He said all calls should go through the main company number to avoid tragedies like this.

"I can't hop into her mind, Clara's mind," Aspen said. "We are never going to have that opportunity. If she did give the phone number it was probably just expedite the process."

Photos show the source of the deadly gas leak, pipes leading to a clothes dryer.

Investigators said when friends of the evicted tenant removed the dryer, they forgot to shut the valve. A voicemail from them, on Bender's phone, warned her about the danger.

Apparently unaware, she walked in the house three days later, making it to the kitchen before the blast claimed her life.

"We are still all looking for something or somebody to blame and we can probably split the blame, but at the end of the day, I am not sure that we are going to be able to relieve ourselves of that bias," Aspen said.

It may never be known what caused the gas to explode. Firefighters found numerous items in the debris that could have sparked the blast.

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The Omaha Fire Department has deemed Monday's fatal home explosion accidental, the department said in a release.

Here are the department's findings, per the release:

A tenant was moving from a home on July 23. One of the last items removed from the house was the clothes dryer, which was disconnected from the gas line supplying it by one of people helping with the move, so that the dryer could be taken from the home.

The gas line that supplied the dryer wasn't shut off, allowing natural gas to flow into the structure.

Saturday night, two men who had helped the tenant move went back to the home and noticed a natural gas smell. They notified the tenants.

The tenant notified the property management company of the situation by leaving a voicemail message on Clara Bender's work cellphone Saturday night. It isn't known if Bender received the message.

By Monday, when Bender entered the home, the natural gas had filled the residence. Investigators believe she was in the kitchen of the home when it exploded.

The gas and air mixed to a point where the atmosphere entered into an explosive range and came in contact with an ignition source, triggering the explosion.

A memorial service will be held for Bender at 11 a.m. Friday at the Korisko Larkin Staskiewicz Chapel.

Investigators are referring to the area as a crime scene, but haven't explained why.

The Omaha Fire Department announced Tuesday that crews from the City of Omaha Public Works Department will be cleaning the section of North 65th Street of debris, and that once the process is completed, the street will be reopened. However, the two houses located directly north and the two houses located directly south of the explosion site will remain off limits until city engineers deem them safe to enter.

Residents may return to their homes if their utilities have been restored, the department said in a release.

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The initial call for help came shortly after noon.

"It was just like, boom," Dave Minor, who lives in the area, said. "It just rattled everything."

Fire Battalion Chief Tim McCaw says paramedics took two women who were in the house to an Omaha hospital. One was in critical condition, and the other was in serious condition.

A 14-year-old boy was seriously hurt and taken to the hospital privately.

A neighbor who was in a house next to the home that exploded suffered a concussion, cuts and bruises.

Multiple fire crews responded to the scene, with the initial crews reporting that one home was destroyed, and two other homes were considered "unstable", according to reports by firefighters at the scene.

"(I was) sitting on my front porch, heard a bang and you felt the explosion," said Mercedes Nelson, who lives in the area. "It shook the entire neighborhood. My sister was inside (and it) blew her electricity out instantly. Then it was just raining debris.

"I went out to see what happened, and the house was just gone. It was just rubble. (I) saw some guys helping a lady out. They kicked in the door and got her out. Police came and cleared out the area."

"Every door in the house slammed," said Jack Wagnon, who lives in the area. "So yeah, it was quite crazy."

Jeffery Blount said he was doing dishes Monday morning when he heard a loud boom.

"I thought it was lightning or something," he said. "The house shook. It through me back a little bit, a little from my seat.

"I heard the kids start screaming. I came in the room, I turned the corner and I seen the bedroom ceiling had just collapsed. The hallway collapsed."

"The bookcase fell over on the couch where I was sitting, and my brothers just started screaming," said Zarah Blount, Jeffrey's daughter.

Jeffery was able to get his children outside, but when he soon realized that his wife was trapped.

"I had to pick the ceiling off of her," he said. "The ceiling collapsed on her. She was laying in the bed. She was sleeping."

With the help of neighbors, he was able to rescue his wife.

"I had a higher power to help me," he said. "God came through for me."

His wife was rushed to the hospital and is expected to be OK.

Metropolitan Utilities District crews shut off the natural gas to the house and technicians surveyed the area, verifying that there were no natural gas leaks and that the natural gas facilities were safe.

Other crews reported other homes nearby were damaged by flying debris.

St. Bernard Child Care, one block from the explosion, had to evacuate the neighborhood, and parents were asked to pick up their children. Some broken windows at the school were spotted.

"We encountered a house that was completely obliterated," an official told reporters at the scene. "Everything was destroyed, except for the foundation. Debris had flown across the street to the east and to the south and to the north and to the west."

This is a developing story. We'll update as more information becomes available.